Wire-twisting machine



Dec. 5, 1967 TOKUJI YOSHIDA WIRE-TWISTING MACHINE 4 Sheets-Sheet 1 FiledMarch 15, 1965 Dec. 5, 1967 TOKUJI YOSHlDA 3,355,867

WIRE-TWISTING MACHINE Filed March 15, 1965 4 Sheets-Sheet 2 1967 TOKUJIYOSHIDA 3, 6

WIRE-TWISTING MACHINE Filed March 15, 1965 4 Sheets-Sheet 5 7 Dec. 5,1967 Filed March 15, 1

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United States Patent 3,355,867 WIRE-TWISTING MACHINE Tokuji Yoshida,27-go, 21 2-ch0me, Zenpukuji, Suginamiku, Toyko, Japan Filed Mar. 15,1965, Ser. No. 439,863 Claims priority, application Japan, Mar. 23,1964, 39/ 15,556 5 Claims. (Cl. 57-5854) ABSTRACT OF THE DISCLOSURE Awire-twisting apparatus including a plurality of double twistingdelivery means in each of which a rotatable flier is positioned about afloating frame having a delivery bobbin whereby an element wirewithdrawn from such bobbin may be double twisted per revolution of theflier by being withdrawn during rotation about the floating frametogether with the flier along the flier and in which a double twistingwinding means is such that a plurality of element wires withdrawn fromthe delivery means may be wound on a bobbin carried by a floating framewhile being double twisted per revolution of a flier rotating about thefloating frame during rotation about the floating frame along the flier.

This invention relates generally to twisted wire forming apparatus andmore particularly to wire twisting machines to be used to manufacturecommunication cables and bare twisted wires by collecting and twistingcoated elementwires or bare wires together.

In a Wire-twisting machine wherein, for example, four or;seven deliverybobbins on which are wound element wires made in other machines orapparatus are set in parallel, the element wires are pulled from therespective delivery bobbins, collected together, then twisted with oneanother and wound on a winding bobbin. In order to improve theefficiency, it is desirable not only to increase the rotating speed ofthe rotating part but to also give the same result as if making thenumber of revolutions twice as large by giving two twists perrevolution.

Further, in order to prevent an excess tension from being applied toelement wires during the start and operation of a wire-twisting machineand prevent respective delivery bobbins from idling at the time of asudden stop with the result that excess wires will be delivered to hangdown, it is desirable to automatically adjust a braking pressure appliedto the delivery bobbins and automatically adjust a winding torqueapplied to the winding bobbin according to the case.

Therefore, a first object of the present invention is to provide awire-twisting machine wherein both of each delivery bobbin and a windingbobbin are mounted on respective floating frames and a rotary frame isset to rotate around each of said floating frames so that, when a wireis led along the periphery of said rotary frame, the wire may be doubletwisted per revolution of the rotary frame and further the weight of therotary frame which is a rotating part is so small that its rotatingspeed may be increased.

An additional object of the present invention following the abovementioned object is to support said rotary frame as a cantilever inorder to make the rotation of the rotary frame on the delivery sidesmooth and light.

A further object of the present invention is to make a supporting pieceon one side of the floating frame supporting said delivery bobbin freeto open and close sidewise so that the delivery bobbin may be easily andquickly fitted and removed.

A still further object of the present invention is to provide a devicefor preventing delivery bobbins from "ice idling by using anelectro-magnetic brake to brake the delivery bobbins so that, when thewire twisting machine stops, the exciting current to saidelectromagnetic brake may be large, the braking pressure increased andthe idling of the delivery bobbin at the time of the stop therebyprevented.

Another object of the present invention together with the abovementioned objects is to provide a device for adjusting the torque of awinding torque motor wherein the torque motor is used as a windingtorque source for the winding bobbin so that, only during the operationof the wire-twisting machine, a voltage to generate a fixed torque maybe applied to the torque motor but, simultaneously with the stop of theoperation, the restricting torque of said torque motor reduced and theelongation of the wire thereby prevented.

Another object of the present invention is to set a winding capstan inthe winding apparatus together with an outside delivery capstan so thatboth capstans may be freely selectively used.

These objects and advantages of the present invention are accomplishedby the provision of a newly improved wire-twisting machine wherein areused several delivery apparatus in each of which a supporting piece onone side of a floating frame on which is mounted a delivery bobbin isfree to open and close with a hinge, a rotary frame supported as acantilever being rotatably borne around said floating frame and anelectromagnetic brake set to brake said delivery bobbin, a windingapparatus in which a rotary frame is rotatably borne around a floatingframe on which is mounted a winding bobbin and a torque motor to imparta winding torque to the Winding bobbin is set in the floating frame sothat, when wires from the respective delivery bobbins are to be pulledby means of an outside capstan provided between the delivery apparatusand the winding apparatus or an inside capstan provided on the floatingframe on the winding apparatus side, said wires may be pulled axiallyfirst along the rotary frame on the delivery apparatus side, therebydouble twisted per revolution of said rotary frame, collected by athrottled die and then wound on the winding bobbin also along the rotaryframe on the winding side and the collected wires double twisted perrevolution of said rotary frame.

The rotary frames on the delivery side and winding side include drivingmeans by which said rotary frames are respectively rotated around thestationary delivery bobbins and winding bobbin. Therefore, these rotaryframes are much lighter than the conventional ones generally in wide useand rotated together with the delivery bobbins or winding bobbin, theirrotating speed can be increased, thewound wires prevented fromcollapsing by centrifugal force acting on the delivery bobbins orwinding bobbin and the winding of the collected Wires on the bobbineasily inspected. Specifically, the rotary frame on the delivery side issupported as a cantilever so as to rotate smoothly and lightly.

Further, as the rotary frame on the delivery side is supported as acantilever, in order to fit and remove the delivery bobbin easily, thesupporting piece on one side of the floating frame on the delivery sideis free to open and close with a hinge and includes a fixing means forfixing the same in a closed state so that, when the supporting piece isopened, the delivery bobbin may be fitted or removed and when closed,the delivery bobbin may be securely supported.

The electromagnetic brake for effecting a delivery bobbin braking forceand the torque motor for imparting a winding torque to the windingbobbin include respective electric control circuits. The electriccircuits are operated as operatively connected with starting andstopping buttons for the entire apparatus so as to respectively 3 imparta fixed braking pressure and winding torque to. the delivery bobbins andwinding bobbin.

Further objects and advantages of the invention will become more readilyapparent to persons skilled in the art from the following detailedspecification and annexed drawings and in which drawings:

FIGURE 1 is an elevation of a wire-twisting machine embodying thepresent invention.

FIGURE 2 is a fragmentary plan view illustrating the parts of a deliveryapparatus and an outside capstan.

FIGURE 3 is a view partly in elevation and partly in sectionillustrating a part of the delivery apparatus in detail, the view beingon an enlarged scale.

FIGURE 4 is a partly in elevation and partly in section view of a hingepart of a floating frame in a delivery apparatus.

FIGURE 5 is an exploded perspective view illustrating a part of FIGURE 4in detail.

FIGURE 6 is a control circuit diagram of an electromagnetic brakeprovided for the delivery bobbins and a torque motor connected to thewinding bobbin.

FIGURE 7 is a graph showing the operation of the circuit in FIGURE 6.

In FIGURE 1 of the drawings is illustrated a wiretwisting machineembodying the present invention and denoted generally by referencenumeral 10-. The wiretwisting machine 10 comprises a delivery apparatus12 for delivering a plurality of element wires, an outside capstan '14for pulling the respective element wires from the delivery apparatus 12and a winding apparatus 16 for winding the respective element wirespulled from the delivery apparatus 12 while collecting such wirestwisted together.

In the delivery apparatus 12, as illustrated in FIGURES 2 and 3, fourhollow shafts 22 are rotatably borne in a mount 20 fixed on a base plate18 inclined at an angle so as to intersect with one another on theirforward extensions. The hollow shaft 22 is provided with a step at theouter end projecting out of the mount 20 so as to form a sleeve part 24of a large diameter. A supporting shaft 30 is rotatably set in saidsleeve part 24 through ball bearings 26 and 28, and a floating frame 32is fixed in the middle of the upper part of the rear end to the forwardend of said supporting shaft 30. Inclined edges 34a and 36a are formedon both supporting pieces 34 and 36, respectively of said floating frame32. Bearing recesses 34b and 36b are provided opposite each other in themiddle parts of said inclined edges 34a and 36a, respectively. Suchrecesses are positioned below the axis of the supporting shaft 30 andboth side shafts 40 of a delivery bobbin 38 on which is wound an elementwire are removably mounted on said bearing recesses 34b and 36b so thatthe center of gravity of the floating frame 32 may be placed below theposition of the axis of the supporting shaft 30 whereby the floatingframe 32 may be stopped and supported irrespective of the rotation ofthe hollow shaft 22.

Further, the supporting piece 34 on one side of said floating frame 32is integral with the floating frame but the supporting piece 36 on theother side is separate from the floating frame 32 as illustrated inFIGURES 4 and 5. A ring 42 is formed at the base end of said supportingpiece 36. A ring 44 is formed on the side of the floating frame 32complementary to said ring 42 and the rings 42 and 44 are aligned witheach other. The supporting piece 36 is fitted to the floating frame 32and a shaft 46 then inserted through said rings 42 and 44 so that thesupporting piece 36 may be connected to the floating frame 32. Thisprovides an arrangement free to open and close through a hinge 48consisting of the rings 42 and 44. A projection 50 formed on the lowersurface of the ring 42 fits into a groove 52 in the closed position ofthe ring 44. A screw part 54 is provided on a part of the shaft 46 andis screwed into the ring 42 whereby upon rotating said shaft 46 by ahandle 46a formed at the upper part thereof, the supporting piece 36 maybe moved up and down to remove and insert the projection 50 from andinto the groove 52, respectively. When the projection 50 is thus removedfrom the groove 52, the supporting piece 36 can be freely opened andclosed by a handle 36c at the forward end of the supporting piece 36. Onthe other hand, if the shaft 46 is rotated and lowered while thesupporting piece 36 is kept closed, the projection 50 will fit in thegroove 52 so that the supporting piece 36 may not freely open. Thus, infitting and removing the delivery bobbin 38 to and from the floatingframe 32, by opening the supporting piece 36 on one side of saidfloating frame 32, the fitting and removing operations can be easily andquickly performed. Further the part represented by a reference numeral32a in FIGURE 3 is a mounting piece for temporarily supporting saiddelivery bobbin 38 in fitting or removing the bobbin into or from thefloating frame 32. The mounting piece 32a is integral with the floatingframe 32 so that, when the delivery bobbin 38 is to be removed, thedelivery bobbin 38 may be prevented from dropping as soon as thesupporting piece 36 is opened and, when the delivery bobbin is to befitted, it may be placed on said mounting piece 32a and the supportingpiece 36 closed.

Outside the floating frame 32 on which is hung the above mentioneddelivery bobbin 38 is provided an oval shaped flier 56 surrounding thebobbin with a proper clearance as illustrated in FIGURE 3. The flier 56is fixed in the center of the base part to the outside of the front endof the sleeve part 24 and rotates in unison with the hollow shaft 22. Apulley 58 is rotatably mounted within and adjacent the front end of theflier 56, and a pulley 60 on the outside near the base part of the flieron intermediate pulley 64 is supported with its peripheral edge at theoutside rear end of a slot 62 in the flier 56. Further, an elongatedopening 66 is made in the sleeve part 24 in the rear of the bearing partof the supporting shaft 38. In said elongated opening 66 is rotatablysupported a pulley 68 with its peripheral edge on the axis of the hollowshaft 22. Thus, as shown in FIGURE 3, an element wire a payed forwardfrom the delivery bobbin 38 passes out the pulley 58, through the slot62, over the intermediate pulley 64-, the pulley 60' and pulley 68, ispassed through the hollow shaft 22 and pulled from the mount 20 throughthe rear end of the hollow shaft 22.

The four hollow shafts 22 rotate simultaneously at the same speed in thesame direction. As illustrated in FIG- URE 1, a gear 70 is secured toeach hollow shaft 22 within the mount 20 and meshes with a gear 74 on asecond intermediate shaft 72 in the mount 20. A belt 82 is trained on apulley 76 fixed to said intermediate shaft 72 and a pulley 80 fixed to afirst intermediate shaft 78 also mounted in the mount 20. The firstintermediate shaft 78 projects from the mount 20, and a gear 84 is fixedon the projecting end of said shaft 78. The gear 84 meshes with a gearfixed on an output shaft 88a of a reduction gear 86 provided on the baseplate 18. Belts are trained about a pulley 94 on an input shaft 92 ofthe reduction gear 86 and a pulley 98 operably related to motor 96 sothat the operation of the motor 96 may be reduced by the reduction gear86 and transmitted to each hollow shaft 22. The flier 56 fixed to saidhollow shaft 22 is rotated around the delivery bobbin 38, stopped andhung by the floating frame 32 so that the element wire a from eachdelivery bobbin 38 may be twisted twice in the parts of the pulleys 58and 60.

Each element wire a thus twisted twice is wound on rollers 106 of theoutside capstan 14 through a pulley 102 provided on the rear surface ofthe mount 28 and a pulley 104 on the reduction gear 86. The rollers 106are rotated in relation to the input shaft 92 so that each element wirea from the delivery apparatus 12 may be withdrawn. The respectiveelement wires a are then led to a throttled die 108 on the mount 28a,collected 7 therein and drawn into the winding apparatus 16 via thecenter of the rotation through a hollow tube 110 passing through themount 20a.

In said winding apparatus 16, as illustrated in FIG- URE 1, a flier 112is supported between mounts 20a and 20b on the base plate 18 so as to berotatable with shafts 114a and 11% at both ends thereof. At both ends ofsaid flier 112 are provided bearing parts 116a and 116b which arealigned with its center of rotation. Between each of the bearing parts116a and 116b is supported by a ball bearing 122 a shaft 120 providednear the upper part of each end of a floating frame 118. Said floatingframe 118 has its center of gravity placed below the position of theaxis of the shaft 120 so as to always be supported in a stationarymanner irrespective of the rotation of the flier 112. Within saidfloating frame 118, a winding bobbin 124 is removably supported and atorque motor 128 operably connected with said winding bobbin 124 througha gear train 126 is setso that a torque in the winding direction isalways imparted to the winding bobbin 124 by said torque motor 128. Aninside capstan 134 consisting of a driving roller 130 and guide rollers132a and 1132b is supported by supporting pieces. A worm wheel 136 isfixed to a shaft 1300 of the driving roller 130. An operably connectingshaft 140 having at one end a worm 138 meshing with said worm wheel 136is supported in the floating frame 118. Said connecting shaft 140projects at the other end from the floating frame 118 and a gear 142 isfixed to the projecting end of said shaft 140. The gear 142 meshes witha gear 144 formed on the outer periphery of the bearing part 116b of theflier 112 so that when the flier 112 rotates, the rotation of the gear144 rotating in unison with said flier 112 may be transmitted to thedriving roller 130 through the gear 142, shaft 148, worm 138 and wormwheel 136 for rotating the driving roller 130 in the winding direction.Further, in order to impart a rotary motion to said flier 112 with inthe mounts 26a and 20b, a pulley 146 is fixed to each of the shafts 114aand 114b on both sides of the flier 112. A pulley 150 is fixed to eachside of a power transmitting shaft 1148 supported between the mounts 20aand 28b with the pulley 150 being opposite the pulley 146. A belt 158 istrained over said pulleys 146 and 150 and a gear 154 secured to one endof the shaft 148 meshes with a gear 156 fixed to the end of anotheroutput shaft 88b of reduction gear 86 so that the rotation of the motor96 may be transmitted to the fliers 56 of the delivery apparatus 12 fromthe output shaft 88a of the reduction gear 86 and also to the flier 112of the winding apparatus 16 from the output shaft 88b of the reductiongear 86 to rotate said flier 112. A through hole 158 is provided in eachof the bearing parts 116a and 116b of the flier 112.

It will be noted that pulleys 161 and 162 positioned through each hole158 in the parts 116a and 116b, respectively and pulleys 164 and 166located on each side of the flier 112 coact so that collected wires bleaving the tube 111] pass through a central orifice 168, about pulley160, over pulleys 164 and 166, the pulley 162, the guide roller 132a,guide roller 13212 and wound on the bobbin 124. Meanwhile, the flier 112is rotated so that the collected wires b may be twisted twice in theparts of the pulleys 160 and 162.

In thus winding on the winding bobbin 124 the respective element wires afrom the delivery bobbins 38 while collecting and twisting the sametogether, in order to feed the collected wires b of said element wiresa,

.there are provided two outside capstans 14 and inside capstans 134.However, either of the capstans 14 and 134 may be selectively usedaccording to the operating conditions or if necessary both may besimultaneously used.

In the case of performing an operation of twisting electric wires in theabove apparatus, if the delivery bobbin 38 is merely supported in thefloating frame 32, the bobbin 38 will rotate too much due to its inertiaduring the operation and, as a result, the element wire a withdrawn fromthe delivery bobbin 38 will be likely to hang downwardly during itstravel. Therefore, generally a braking pressure is applied to thedelivery bobbin so 5 that a constant tension is given to the elementwire a withdrawn from each delivery bobbin. However, if the brakingpressure to be applied to the delivery bobbin 38 is too high, thetension applied to the element wire a will be too great. Therefore, itcannot be made too high. If the entire apparatus is suddenly stopped andthe operation arrested, the delivery bobbin 38 will idle due to itsinertia and an excess element wire a will be likely to be delivered. Onthe other hand, if a fixed torque is always applied to the windingbobbin 124 via the torque motor 128 during the operation and if theoperation is stopped, the electric charge as existing during theoperation is applied to the torque motor 128 to prevent the windingbobbin 124 from reversing and the collected Wires [2 and the elementwires a from hanging downwardly, the torque of said torque motor 128will be too large resulting in elongation of the wires.

Therefore, each delivery bobbin 38 is provided with an electro-magneticbrake 200 wired with the torque motor 128 and the motor 96 as shown inFIGURE 6. More specifically the braking pressure of the electromagneticbrake 280 to be applied to each delivery bobbin is adjustablesimultaneously throughout by adjusting a component SD SD, orindividually by separately adjusting variable resistances VR to VRFurther, the torque of the torque of the torque motor 128 is also madefreely adjustable by adjusting a component SD as shown in FIGURE 6. Onthe other hand, a variable resistance VR inserted in one line of saidtorque motor 128 and in parallel with the variable resistance VR isconnected in a series circuit of a contact MS 1 to be closed by theenergization of a magnetic switch M5 and a contact MS 1 to be opened bythe energization of a magnetic switch M8 Further, the magnetic switch MSis so made as to close not only the contact MS -1 but also the contactMS 2 when it is energized. On the other hand, the magnetic switch M8 isalso so made as to open the contact M S 1 and switch a voltage changingswitch MS -2 of the electromagnetic brake 269 from a low voltage side Lto a high voltage side H when it is energized.

A magnetic switch MS has in series in its circuit a starting switch Aopened in the normal state and a stopping switch B closed in the normalstate. In parallel with said starting switch A is connected a contact MS-1 to be closed when the magnetic switch M5 is energized so that, evenif the magnetic switch M8 is energized by closing the starting switch Aand then the starting switch A is released, the magnetic switch M8remains energized until the stopping switch B is opened through thecontact MSg-l closed by the energization of the magnetic switch 55 M8Said magnetic switch M8 is so made as to close not only the contactMSg-l in a self-holding circuit but also a main contact MS -2 of themotor 96 and at the same time close a contact MS -3 and open a contactMS -4 when it is energized. Further, said circuit included two 60 timerrelays TM and TM Although electricity is simultaneously passed throughboth timer relays TM and 'IMg in a fixed time after the electricity ispassed, the timer relay TM 2 will first operate and, by the energizationof said timer relay TM its contact TNIg-l 'will be closed 65 and themagnetic switch M8 will be operated. Onthe other hand, following in thesame manner in a fixed time, the timer relay TM operates and, by theenergization of said timer relay TM a contact TM -1 will open.

Therefore, as shown in FIGURE 6, when an electric 70 source switch MS isclosed, an electric current will be fed to the torque motor 128 with thevariable resistance VR inserted in one line of the motor, so said torquemotor 128 will generate a torque lower than a fixed torque and anexciting current to generate a fixed braking 75 pressure will be fed tothe electromagnetic brake 20th through the voltage changing switch MSg-Zswitched to the low voltage side L. Here, if the starting switch A isclosed, the magnetic switch M8 will be energized, the contact MS -1closed and the magnetic switch MS will be self-held. On the other hand,by the energization of said magnetic switch M the main contact MS -2will be closed, the motor 96 will start and at the same time the contactMS -3 will close and the contact MS -4 will open. When said contact MS-3 closes, the magnetic switch MS will operate through the contact TM 1,the contact MS 2 will close, the self-holding circuit of said magneticswitch MS will close, the contact MS 1 will also close at the same time,and a by-pass circuit connected in parallel with the variable resistanceVR5 inserted in one line of the torque motor 128 will be closed, withthe restricted torque of the torque motor 128 being increased togenerate a fixed torque. Hence, during the operation, in this condition,the braking pressure of the electromagnetic brake 200 will be kept at afixed low value and the winding torque of the torque motor 128 at afixed high value.

Then, when the stopping switch B is pushed and opened to terminate orstop the operation, the magnetic switch M8 will be deenergized, thecontact MS -1 will open, its self-holding circuit broken, the maincontact MS -2 will also open, the passage of electricity to the motor 96will be interrupted, and at the same time the contact MS -3 will open,the contact MS -4 will close so that electricity passes through thetimer relays TM and TM through the contact MS 2. When electricity isthus passed through the timer relays TM and TM in a fixed time, thetimer relay TM will operate to close the contact TM2-1, with themagnetic switch M82 being energized to open the contact MS -1. Thevoltage changing switch MSg-Z will be switched from the low voltage sideL to the high voltage side H, whereby the torque motor 128 will returnto the state in which the variable resistance VR is inserted in one linethereof, and the produced torque will be reduced to the low valueexisting prior to starting. On the other hand, a high voltage currentwill be fed to the electromagnetic brake 200 through the voltagechanging switch MS -2 switched to the high voltage side H and, as aresult, the braking pressure of the electromagnetic brake 200 willquickly rise. Then, the timer relay TM will operate also in a fixed timeto open the contact TM 1. When the contact TM -1 is thus opened, themagnetic switch MS will be de-energized and the contacts MS 1 and MS 2will open. When said contact MS 2 opens, the magnetic switch M8 andtimer relays TM and TM will be also tie-energized. When the magneticswitch M5 is thus deenergized, the contact MS2-1 will be closed and thevoltage changing switch MS -2 will be switched from the high voltageside H to the low voltage side L so that the braking pressure of theelectromagnetic brake 200 will be returned to a fixed low value. On theother hand, when the timer relays TM; and TMg are de-energized, thecontact TM 1 will be closed, the contact TM2-1 opened and the initialstate will exist. The above operation can be graphed as in FIGURE 7.

The invention is not to be confined to any strict conformity to theshowings in the drawings but changes or modifications may be madetherein so long as such changes or modifications mark no materialdeparture from the spirit and scope of the appended claims.

What is claimed is:

1. A wire communication cable and rope twisting machine comprising aplurality of double twisting delivery ing winding apparatus so made thata plurality of element wires withdrawn from said delivery apparatus maybe wound on a winding bobbin carried by a floating frame while beingtwisted double per revolution of a flier rotating around the floatingframe by being rotated around the 5 floating frame along said flier, anoutside capstan positioned between the delivery apparatus and thewinding apparatus, and inside capstan located within said floating frameof said winding apparatus capable of selective and simultaneous use.

2. The twisting machine according to claim 1 having delivery apparatusin each of which the floating frame is rotatably supported with asupporting shaft at the front end of a hollow shaft rotatably supportedin amount and the center of gravity of said floating frame beingpositioned below the rotating axis of the floating frame so that, evenwhen the hollow shaft rotates, the floating frame may be kept stationaryand the flier fixed in the base part to the hollow shaft and supportedas a cantilever being formed to surround said floating frame so that anelement wire withdrawn from the delivery bobbin carried by the floatingframe may be led rearward along one side of the flier from the front ofsaid flier and withdrawn through the hollow shaft.

3. The delivery apparatus supported as a cantilever according to claim 2wherein a supporting piece on one side of the floating frame is free toopen and close by means of a hinge.

4. A wire communication cable and rope twisting machine comprising aplurality of double twisting delivery apparatus in each of which arotatable flier is positioned around a floating frame carrying adelivery bobbin so that an element wire withdrawn from said deliverybobbin may be double twisted per revolution of the flier by beingwithdrawn while being rotated around the floating frame together withsaid flier along the flier and a double twisting winding apparatus somade that a plurality of element wires withdrawn from said deliveryapparatus may be wound on a winding bobbin carried by a floating framewhile being double twisted per revolution of a 0 flier rotating aroundthe floating frame by being rotated around the floating frame along saidflier, an electromagnetic brake to brake the delivery bobbin so that atthe time of starting and during the operation, a required excitingcurrent may be made to flow to apply a fixed braking pressure, a timer,and, when the operation is stopped, in a fixed time, a voltage changingswitch may be automatically switched through said timer to increase theexciting current and temporarily increase the braking pressure.

5. A wire communication cable and rope twisting machine comprising aplurality of double twisting delivery apparatus in each of which arotatable flier is positioned around a floating frame carrying adelivery bobbin so that an element wire withdrawn from said deliverybobbin may be double twisted per revolution of the flier by beingwithdrawn while being rotated around the floating frame together withsaid flier along the flier and a double twisting winding apparatus somade that a plurality of element wires withdrawn from said deliveryapparatus may be wound on a winding bobbin carried by a floating framewhile being double twisted per revolution of a flier rotating around thefloating frame by being rotated around the floating frame along saidflier, a torque motor constituting a winding torque generating sourcefor the winding bobbin, a timer, a resistance inserted in one line ofsaid torque motor and a by-pass circuit having a contact in parallelwith said resistance connected so that during the operation the contactof said by-pass circuit may be closed and an electric charge to generatea fixed torque may be applied to the torque motor and that, when theoperation is stopped, in a fixed time, the contact of the by-passcircuit may automatically open through the timer and the restrictedtorque of the torque motor may be thereby reduced.

(References on following page) References Cited UNITED STATES PATENTSKraft 57--58.55 Kraft 57-58465 Nelson 5758.54 Larsen et a1 5758.54 Claryet a1. 57--58.55 Bruestle 57-5834 10 3,142,952 8/1964 Kraft et a1.5758.65 X 3,158,981 12/1964 Heuser 57-58.65

FOREIGN PATENTS 137,790 -8/ 1961 Russia.

FRANK J. COHEN, Primary Examiner.

D. WATKINS, Assistant Examiner.

1. A WIRE COMMUNICATION CABLE AND ROPE TWISTING MACHINE COMPRISING APLURALITY OF DOUBLE TWISTING DELIVERY APPARATUS IN EACH OF WHICH AROTATABLE FLIER IS POSITIONED AROUND A FLOATING FRAME CARRYING ADELIVERY BOBBIN SO THAT AN ELEMENT WIRE WITHDRAWN FROM SAID DELIVERYBOBBIN MAY BE DOUBLE TWISTED PER REVOLUTION OF THE FLIER BY BEINGWITHDRAWN WHILE BEING ROTATED AROUND THE FLOATING FRAME TOGETHER WITHSAID FLIER ALONG THE FLIER AND A DOUBLE TWISTING WINDING APPARATUS SOMADE THAT A PLURALITY OF ELEMENT WIRES WITHDRAWN FROM SAID DELIVERYAPPARATUS MAY BE WOUND ON A WINDING BOBBIN CARRIED BY A FLOATING FRAME